pt-machine.h 2.6 KB

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  1. /* Machine-dependent pthreads configuration and inline functions.
  2. SuperH version.
  3. Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
  4. This file is part of the GNU C Library.
  5. Contributed by Niibe Yutaka <gniibe@m17n.org>.
  6. The GNU C Library is free software; you can redistribute it and/or
  7. modify it under the terms of the GNU Lesser General Public License as
  8. published by the Free Software Foundation; either version 2.1 of the
  9. License, or (at your option) any later version.
  10. The GNU C Library is distributed in the hope that it will be useful,
  11. but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13. Lesser General Public License for more details.
  14. You should have received a copy of the GNU Lesser General Public
  15. License along with the GNU C Library; see the file COPYING.LIB. If not,
  16. write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17. Boston, MA 02111-1307, USA. */
  18. #ifndef _PT_MACHINE_H
  19. #define _PT_MACHINE_H 1
  20. #ifndef __ASSEMBLER__
  21. #ifndef PT_EI
  22. # define PT_EI extern inline
  23. #endif
  24. extern long int testandset (int *spinlock);
  25. extern int __compare_and_swap (long int *p, long int oldval, long int newval);
  26. /* Spinlock implementation; required. */
  27. PT_EI long int
  28. testandset (int *spinlock)
  29. {
  30. int ret;
  31. __asm__ __volatile__(
  32. "tas.b @%1\n\t"
  33. "movt %0"
  34. : "=r" (ret)
  35. : "r" (spinlock)
  36. : "memory", "cc");
  37. return (ret == 0);
  38. }
  39. /* We want the OS to assign stack addresses. */
  40. #define FLOATING_STACKS 1
  41. /* Maximum size of the stack if the rlimit is unlimited. */
  42. #define ARCH_STACK_MAX_SIZE 32*1024*1024
  43. /* Get some notion of the current stack. Need not be exactly the top
  44. of the stack, just something somewhere in the current frame. */
  45. #define CURRENT_STACK_FRAME stack_pointer
  46. register char * stack_pointer __asm__ ("r15");
  47. /* Return the thread descriptor for the current thread. */
  48. struct _pthread_descr_struct;
  49. #define THREAD_SELF \
  50. ({ struct _pthread_descr_struct *self; \
  51. __asm__("stc gbr,%0" : "=r" (self)); self;})
  52. /* Initialize the thread-unique value. */
  53. #define INIT_THREAD_SELF(descr, nr) \
  54. ({ __asm__ __volatile__("ldc %0,gbr" : : "r" (descr));})
  55. /* Access to data in the thread descriptor is easy. */
  56. #define THREAD_GETMEM(descr, member) THREAD_SELF->member
  57. #define THREAD_GETMEM_NC(descr, member) THREAD_SELF->member
  58. #define THREAD_SETMEM(descr, member, value) THREAD_SELF->member = (value)
  59. #define THREAD_SETMEM_NC(descr, member, value) THREAD_SELF->member = (value)
  60. #endif /* __ASSEMBLER__ */
  61. #endif /* pt-machine.h */